{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{S[table-format=1.3]S[table-format=1.3]S[table-format=1.3]S[table-format=1.3]}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}\\
                    &\multicolumn{1}{c}{\specialcell{Social \\ Proximity}}&\multicolumn{1}{c}{\specialcell{Likely to \\ be friends}}&\multicolumn{1}{c}{\specialcell{Trust}}&\multicolumn{1}{c}{\specialcell{Closeness}}\\
\midrule
\midrule
Sample mean         &      0.5481         &      3.4385         &      2.9713         &      2.7088         \\
Sample standard deviation&    (0.2575)         &    (1.2287)         &    (1.2661)         &    (1.5245)         \\
\midrule\multicolumn{4}{l}{\textit{Panel A: Average hydrocortisone effect$^a$}} \\ \quad Hydrocortisone effect&      0.0123         &0.0978$^{**}$         &      0.0313         &      0.0232         \\
                    &    (0.0099)         &    (0.0450)         &    (0.0477)         &    (0.0584)         \\
\midrule \multicolumn{4}{l}{\textit{Panel B: Average coethnicity effect$^b$}} \\ \quad Coethnicity effect&0.0817$^{***}$         &0.3066$^{***}$         &0.3607$^{***}$         &0.3908$^{***}$         \\
                    &    (0.0052)         &    (0.0251)         &    (0.0268)         &    (0.0306)         \\
\midrule\multicolumn{4}{l}{\textit{Panel C: Interaction of hydrocortisone and coethnicity$^c$}} \\ \quad Interaction effect&     -0.0051         &      0.0090         &     -0.0385         &     -0.0388         \\
                    &    (0.0101)         &    (0.0496)         &    (0.0523)         &    (0.0591)         \\
\midrule Participants&     {1,784}         &     {1,784}         &     {1,784}         &     {1,784}         \\
Decisions per participant&         {4}         &         {4}         &         {4}         &         {4}         \\
Decisions           &     {7,136}         &     {7,136}         &     {7,136}         &     {7,136}         \\
\bottomrule
\multicolumn{5}{p{0.73\hsize}}{\footnotesize \textit{Notes}: $^a$ The average hydrocortisone effect is calculated as in equation~\eqref{eqn: Calculated Hydro Effect}. $^b$ The average coethnicity effect is calculated as in equation~\eqref{eqn: Calculated Coethnity Effect}. $^c$ The interaction effect is given by $\hat{\beta}_3$ in equation~\eqref{eqn: Main Specification}. All terms are described in the text. In this specification, we control for the interaction of a same-gender and same-age group indicator with hydrocortisone as well as gender, age group and ethnicity fixed effects of both players. Social proximity refers to the average measures of likelihood to be friends, trust and closeness rescaled to lie between 0 and 1. Likelihood to be friends and trust are set on Likert scales from 1 to 5 while closeness is set on a Likert scale from 0 to 5. Standard errors clustered at the participant level are reported in parentheses. Significance is denoted by \sym{*} \(p<0.1\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\).}\\
\end{tabular}
}
